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add IsLast property to PassStoreContentChunk

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- add special handling of the bit 23 in the 24-bit ChunkSize field
- make the constructor set the property depending on that bit
This commit is contained in:
Slavasil
2025-12-01 15:43:03 +03:00
parent fecab564b7
commit 1899284277
1 changed files with 5 additions and 0 deletions
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5
src/KeyKeeper/PasswordStore/Crypto/PassStoreContentChunk.cs
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@@ -14,6 +14,7 @@ namespace KeyKeeper.PasswordStore.Crypto;
/// </summary> /// </summary>
public class PassStoreContentChunk public class PassStoreContentChunk
{ {
public bool IsLast { get; }
private byte[] chunk; private byte[] chunk;
private int chunkLen; private int chunkLen;
@@ -45,6 +46,9 @@ public class PassStoreContentChunk
throw PassStoreFileException.UnexpectedEndOfFile; throw PassStoreFileException.UnexpectedEndOfFile;
} }
IsLast = (chunkLen & (1 << 23)) != 0;
chunkLen &= ~(1 << 23);
if (chunk.Length != chunkLen + 3 + HMAC_SIZE) if (chunk.Length != chunkLen + 3 + HMAC_SIZE)
{ {
throw PassStoreFileException.UnexpectedEndOfFile; throw PassStoreFileException.UnexpectedEndOfFile;
@@ -104,6 +108,7 @@ public class PassStoreContentChunk
{ {
throw PassStoreFileException.UnexpectedEndOfFile; throw PassStoreFileException.UnexpectedEndOfFile;
} }
chunkLen &= ~(1 << 23); // 23 бит имеет специальное значение
byte[] chunk = new byte[3 + HMAC_SIZE + chunkLen]; byte[] chunk = new byte[3 + HMAC_SIZE + chunkLen];
if (s.Read(chunk) < chunk.Length) if (s.Read(chunk) < chunk.Length)
{ {